[Preset] Add Apple Silicon preset

(cherry picked from commit afb3110)

Author: shahmishal

utils/build-presets.ini

@@ -358,6 +358,11 @@ install-swiftpm
 install-swift-driver
 install-libcxx
 
+[preset: buildbot_incremental,tools=RA,stdlib=RA,apple_silicon]
+mixin-preset=buildbot_incremental,tools=RA,stdlib=RA
+
+swift-darwin-supported-archs=arm64
+
 [preset: buildbot_incremental,tools=RA,stdlib=RA,xcode]
 mixin-preset=buildbot_incremental,tools=RA,stdlib=RA
 build-subdir=buildbot_incremental_xcode